.page-about {
  --pa-ink-soft: #5d6a76;
  --pa-ink-body: #3f4b57;
  --pa-line-light: rgba(46, 58, 70, 0.14);
  --pa-line-dark: rgba(201, 212, 221, 0.18);
  overflow-x: clip;
  background: var(--lg-fog);
  color: var(--lg-text);
}

/* ---------- 区块底座 ---------- */
.page-about .pa-band {
  position: relative;
  padding: clamp(56px, 8vw, 110px) 0;
}
.page-about .pa-band--fog { background: var(--lg-fog); color: var(--lg-text); }
.page-about .pa-band--white { background: var(--lg-white); color: var(--pa-ink-body); }
.page-about .pa-band--ink { background: var(--lg-ink); color: var(--lg-text); }

/* ---------- 通用排版原子 ---------- */
.page-about .pa-eyebrow {
  margin: 0 0 14px;
  font-family: var(--lg-font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--lg-gold);
}
.page-about .pa-eyebrow--ink { color: #8a6a2f; }
.page-about .pa-eyebrow--gold { color: var(--lg-gold); }

.page-about .pa-h2 {
  margin: 0;
  max-width: 24ch;
  font-size: clamp(24px, 3.6vw, 40px);
  font-weight: 700;
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: #f2f6f9;
}
.page-about .pa-h2--ink { color: var(--lg-ink); }

.page-about .pa-h3 {
  margin: 0 0 12px;
  font-size: 18px;
  font-weight: 700;
  color: #eef4f8;
}
.page-about .pa-band--white .pa-h3 { color: var(--lg-ink); }

.page-about .pa-body {
  margin: 0 0 1em;
  font-size: 15px;
  line-height: 1.85;
  color: #c1cdd7;
}
.page-about .pa-band--white .pa-body { color: var(--pa-ink-body); }
.page-about .pa-body a {
  color: var(--lg-gold);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}
.page-about .pa-band--white .pa-body a { color: #a8641f; }
.page-about .pa-body a:hover { color: var(--lg-red); }

.page-about .pa-head {
  max-width: 860px;
  margin-bottom: clamp(32px, 4.5vw, 56px);
  padding-bottom: 20px;
  border-bottom: 1px solid var(--pa-line-dark);
}
.page-about .pa-head--ink { border-bottom-color: var(--pa-line-light); }
.page-about .pa-head__note {
  margin: 16px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: #9db0bd;
}
.page-about .pa-head--ink .pa-head__note { color: var(--pa-ink-soft); }

/* ---------- 首屏 ---------- */
.page-about .pa-hero {
  padding-top: clamp(26px, 4vw, 48px);
  padding-bottom: clamp(64px, 9vw, 130px);
  overflow: hidden;
}
.page-about .pa-hero::before {
  content: "";
  position: absolute;
  inset: -20% -25% auto -25%;
  height: 160%;
  background:
    radial-gradient(620px 380px at 78% 14%, rgba(227, 166, 74, 0.20), transparent 64%),
    radial-gradient(520px 380px at 4% 86%, rgba(18, 179, 155, 0.16), transparent 66%);
  pointer-events: none;
}
.page-about .pa-hero > .lg-container { position: relative; z-index: 1; }

.page-about .pa-hero__ghost {
  position: absolute;
  right: -2%;
  bottom: -0.18em;
  z-index: 0;
  font-family: var(--lg-font-mono);
  font-size: clamp(120px, 26vw, 340px);
  font-weight: 300;
  line-height: 1;
  letter-spacing: -0.04em;
  color: rgba(244, 246, 247, 0.045);
  pointer-events: none;
  user-select: none;
}

.page-about .pa-crumb { margin-bottom: clamp(24px, 4vw, 44px); }
.page-about .pa-crumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: #94a5b2;
}
.page-about .pa-crumb a {
  color: #c3d0da;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.page-about .pa-crumb a:hover { color: var(--lg-gold); border-bottom-color: var(--lg-gold); }
.page-about .pa-crumb li + li::before { content: "/"; margin-right: 8px; color: #6d7d8a; }

.page-about .pa-hero__title {
  margin: 0;
  max-width: 18ch;
  font-size: clamp(30px, 7.2vw, 68px);
  font-weight: 300;
  line-height: 1.12;
  letter-spacing: -0.015em;
  color: #f6f9fb;
}
.page-about .pa-hero__lead {
  margin: clamp(20px, 3vw, 32px) 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: #c3d0da;
}

.page-about .pa-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(36px, 5vw, 60px);
  background: var(--pa-line-dark);
  border: 1px solid var(--pa-line-dark);
}
.page-about .pa-stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(16px, 2.4vw, 26px);
  background: rgba(20, 28, 36, 0.38);
  transition: background 0.3s ease;
}
.page-about .pa-stat:hover { background: rgba(20, 28, 36, 0.68); }
.page-about .pa-stat__value {
  font-size: clamp(28px, 4.4vw, 44px);
  font-weight: 300;
  line-height: 1;
  color: var(--lg-gold);
}
.page-about .pa-stat__label {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: #9fadba;
}

/* ---------- 起点 ---------- */
.page-about .pa-origin__grid { row-gap: clamp(28px, 4vw, 48px); }
.page-about .pa-origin__figure { margin: 0; }
.page-about .pa-origin__figure .lg-media { border: 1px solid var(--pa-line-light); }

.page-about .pa-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1px;
  margin-top: clamp(24px, 3vw, 36px);
  background: var(--pa-line-light);
  border-top: 1px solid var(--pa-line-light);
  border-bottom: 1px solid var(--pa-line-light);
}
.page-about .pa-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  background: var(--lg-white);
}
.page-about .pa-fact__n {
  font-size: clamp(26px, 3.4vw, 36px);
  font-weight: 300;
  line-height: 1;
  color: var(--lg-red);
}
.page-about .pa-fact__t {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--pa-ink-soft);
}

/* ---------- 时间轴 ---------- */
.page-about .pa-tl {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .pa-tl__item + .pa-tl__item { border-top: 1px solid var(--pa-line-dark); }

.page-about .pa-node { margin: 0; }
.page-about .pa-node__sum {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas:
    "year delta"
    "head head";
  align-items: center;
  gap: 10px 12px;
  padding: 22px 0;
  cursor: pointer;
  list-style: none;
}
.page-about .pa-node__sum::-webkit-details-marker { display: none; }
.page-about .pa-node__sum::marker { content: ""; }
.page-about .pa-node__sum:focus-visible { outline: 2px solid var(--lg-gold); outline-offset: 4px; }

.page-about .pa-node__year {
  grid-area: year;
  font-size: 26px;
  font-weight: 300;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--lg-gold);
}
.page-about .pa-node__delta {
  grid-area: delta;
  font-size: 13px;
  text-align: right;
  color: #93a5b2;
}
.page-about .pa-node__head {
  grid-area: head;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.page-about .pa-node__name {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
  color: #eef4f8;
  transition: color 0.25s ease;
}
.page-about .pa-node__brief {
  font-size: 13.5px;
  line-height: 1.7;
  color: #9db0bd;
}
.page-about .pa-node__dot { display: none; }

.page-about .pa-node__body { padding: 0 0 24px; }
.page-about .pa-node__body p {
  margin: 0;
  max-width: 62ch;
  padding-left: 16px;
  border-left: 2px solid rgba(216, 50, 44, 0.5);
  font-size: 14.5px;
  line-height: 1.85;
  color: #a9b9c4;
}

.page-about .pa-tl__foot { margin: clamp(28px, 4vw, 44px) 0 0; }

/* ---------- 团队构成 ---------- */
.page-about .pa-roles__grid {
  row-gap: clamp(32px, 4vw, 48px);
  align-items: center;
}
.page-about .pa-chart {
  position: relative;
  width: 100%;
  max-width: 340px;
  margin: 0 auto;
}
.page-about .pa-donut { display: block; width: 100%; height: auto; }
.page-about .pa-chart__center {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  pointer-events: none;
}
.page-about .pa-chart__num {
  font-size: clamp(34px, 5vw, 44px);
  font-weight: 300;
  line-height: 1;
  color: var(--lg-ink);
}
.page-about .pa-chart__cap {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--pa-ink-soft);
}

.page-about .pa-rolelist {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--pa-line-light);
}
.page-about .pa-role {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr) auto auto;
  align-items: center;
  column-gap: 12px;
  row-gap: 4px;
  padding: 16px 0;
  border-bottom: 1px solid var(--pa-line-light);
  transition: background 0.25s ease;
}
.page-about .pa-role:hover { background: rgba(46, 58, 70, 0.04); }
.page-about .pa-role__dot {
  grid-column: 1;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--lg-grey);
}
.page-about .pa-role__name {
  grid-column: 2;
  font-size: 16px;
  font-weight: 700;
  color: var(--lg-ink);
  white-space: nowrap;
}
.page-about .pa-role__share {
  grid-column: 3;
  font-size: 15px;
  color: #6c7883;
}
.page-about .pa-role__count {
  grid-column: 4;
  min-width: 56px;
  font-size: 14px;
  text-align: right;
  color: #6c7883;
}
.page-about .pa-role__desc {
  grid-column: 2 / -1;
  font-size: 13.5px;
  line-height: 1.7;
  color: #6c7883;
}
.page-about .pa-role--rnd .pa-role__dot { background: var(--lg-red); }
.page-about .pa-role--dsn .pa-role__dot { background: var(--lg-gold); }
.page-about .pa-role--ops .pa-role__dot { background: var(--lg-teal); }
.page-about .pa-role--svc .pa-role__dot { background: var(--lg-orange); }
.page-about .pa-role--sup .pa-role__dot { background: var(--lg-fog); }
.page-about .pa-role--mkt .pa-role__dot { background: var(--lg-forest); }

.page-about .pa-roles__figure { margin: clamp(36px, 5vw, 64px) 0 0; }

/* ---------- 供应链 ---------- */
.page-about .pa-chain__grid { row-gap: clamp(32px, 4vw, 48px); }
.page-about .pa-chain__figure { margin: 0; }

.page-about .pa-meters {
  display: grid;
  gap: 18px;
  margin: clamp(24px, 3vw, 36px) 0 0;
  padding: 0;
  list-style: none;
}
.page-about .pa-meter__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
  font-size: 14px;
  color: #c1cdd7;
}
.page-about .pa-meter__top .lg-num { font-size: 15px; color: var(--lg-teal); }

.page-about .pa-facts--dark {
  margin-top: clamp(28px, 3.6vw, 40px);
  background: var(--pa-line-dark);
  border: 1px solid var(--pa-line-dark);
}
.page-about .pa-facts--dark .pa-fact { background: rgba(20, 28, 36, 0.5); }
.page-about .pa-facts--dark .pa-fact__n { color: var(--lg-orange); }
.page-about .pa-facts--dark .pa-fact__t { color: #93a5b2; }

.page-about .pa-chain__note { margin: clamp(24px, 3vw, 34px) 0 0; }

.page-about .pa-dots {
  height: 84px;
  margin-top: clamp(32px, 4vw, 52px);
  background-image: radial-gradient(rgba(201, 212, 221, 0.30) 1.4px, transparent 1.5px);
  background-size: 15px 15px;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
  pointer-events: none;
}

/* ---------- 服务网络 ---------- */
.page-about .pa-reach__stats {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(20px, 3vw, 44px);
  margin: 0 0 clamp(32px, 4vw, 56px);
  padding: clamp(22px, 3vw, 34px) 0;
  border-top: 1px solid var(--pa-line-light);
  border-bottom: 1px solid var(--pa-line-light);
}
.page-about .pa-reach__stat {
  display: flex;
  flex: 1 1 120px;
  flex-direction: column;
  gap: 8px;
  padding-left: clamp(12px, 1.6vw, 20px);
  border-left: 1px solid var(--pa-line-light);
}
.page-about .pa-reach__stat:first-child {
  padding-left: 0;
  border-left: 0;
}
.page-about .pa-reach__n {
  font-size: clamp(30px, 4.6vw, 48px);
  font-weight: 300;
  line-height: 1;
  color: var(--lg-ink);
}
.page-about .pa-reach__l {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--pa-ink-soft);
}
.page-about .pa-reach__grid { row-gap: clamp(28px, 3.6vw, 44px); }

/* ---------- 长期合作 ---------- */
.page-about .pa-pledge { overflow: hidden; }
.page-about .pa-pledge::after {
  content: "";
  position: absolute;
  top: -30%;
  right: -8%;
  width: 48%;
  height: 165%;
  background: radial-gradient(closest-side, rgba(216, 50, 44, 0.16), transparent 72%);
  pointer-events: none;
}
.page-about .pa-pledge__inner {
  position: relative;
  z-index: 1;
  max-width: 780px;
}
.page-about .pa-pledge__text {
  margin: clamp(20px, 3vw, 28px) 0 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.9;
  color: #b8c6d1;
}
.page-about .pa-pledge__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: clamp(28px, 3.6vw, 40px);
}

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-about .pa-hero__stats { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (min-width: 900px) {
  .page-about .pa-tl::before {
    content: "";
    position: absolute;
    top: 22px;
    bottom: 22px;
    left: 99px;
    width: 1px;
    background: linear-gradient(
      180deg,
      rgba(227, 166, 74, 0.60),
      rgba(201, 212, 221, 0.16) 10%,
      rgba(201, 212, 221, 0.16) 90%,
      rgba(227, 166, 74, 0.35)
    );
  }
  .page-about .pa-node__sum {
    grid-template-columns: 72px 22px minmax(0, 1fr) 110px;
    grid-template-areas: "year dot head delta";
    column-gap: 16px;
    padding: 28px 0;
  }
  .page-about .pa-node__year { font-size: 34px; }
  .page-about .pa-node__delta { font-size: 15px; }
  .page-about .pa-node__dot {
    grid-area: dot;
    display: block;
    justify-self: center;
    align-self: center;
    width: 11px;
    height: 11px;
    border-radius: 50%;
    background: var(--lg-gold);
    box-shadow: 0 0 0 4px rgba(227, 166, 74, 0.16);
    transition: background 0.25s ease, box-shadow 0.25s ease;
  }
  .page-about .pa-node[open] .pa-node__dot {
    background: var(--lg-red);
    box-shadow: 0 0 0 6px rgba(216, 50, 44, 0.20);
  }
  .page-about .pa-node__sum:hover .pa-node__name { color: var(--lg-gold); }
  .page-about .pa-node__body { padding: 0 0 32px 126px; }
}

@media (max-width: 420px) {
  .page-about .pa-role { grid-template-columns: 12px minmax(0, 1fr) auto; }
  .page-about .pa-role__count { display: none; }
  .page-about .pa-role__desc { grid-column: 2 / -1; }
}